An energy-conserving, particle dominated, time-dependent model of 3C58 and its observability at high-energies

TL;DR

This paper develops a time-dependent spectral model for the nebula 3C58, showing it is particle dominated with specific magnetic and particle energy characteristics, and assesses its high-energy observability.

Contribution

It introduces a comprehensive, energy-conserving, time-dependent model of 3C58 that incorporates multiple radiation processes and compares predictions with observational data.

Findings

3C58 is compatible with being a particle dominated nebula.

The model fits multi-frequency data with a broken power law injection.

3C58 is unlikely to be observed by current high-energy telescopes unless local IR backgrounds are significantly higher.

Abstract

We present a time-dependent spectral model of the nebula 3C58 and compare it with available data. The model is for a leptonic nebula, in which particles are subject to synchrotron, inverse Compton, self-synchrotron Compton, adiabatic, and bremsstrahlung processes. We find that 3C58 is compatible with being a particle dominated nebula, with a magnetic field of 35$\mu$G. A broken power law injection fits well the multi-frequency data, with a break energy at about 40 GeV. We find that 3C58 is not expected to appear in VERITAS or MAGIC II, unless the local IR background is a factor of \sim20 off Galactic models averages. For cases in which the CMB dominates the inverse Compton contribution, we find that 3C58 will not be visible either for the Cherenkov Telescope Array.